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Finding the Fourth Proportional to 4,611.20, 6,917.19 and 1,978.82

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Solution

The fourth proportional to 4,611.20, 6,917.19 and 1,978.82 is: 2,968.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,611.20 : 6,917.19 = 1,978.82 : x
  2. Step 2: Convert to fraction form
    4,611.20/6,917.19 = 1,978.82/x
  3. Step 3: Cross multiply
    4,611.20x = 6,917.19 × 1,978.82
  4. Step 4: Simplify right side
    4,611.20x = 13,687,873.92
  5. Step 5: Solve for x
    x = 13,687,873.92/4,611.20
  6. Step 6: Final answer
    x = 2,968.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.